Variable transmission means



1957 s Sheets-Sheet 1 @gA/(l/ZENTOR TTORNEYS C. BANCROFT VARIABLE TRANSMISSION MEANS Filed March 6-,

Dec. 7, 1937.

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VARIABLE TRANSMISSION MEANS Filed March 6, 1957 3 Sheets-Sheet 2 WlZ E z. O

INVENTOR ATTORNEYS C. BANCROFT Dec. 7, 1937.

VARIABLE TRANSMISSION MEANS Filed March 6, 1957 3 Sheets-Sheet 3 MI/IIIIIIIII m m m 0 V M /W 1 A Y MB Patented Dec. "7, 1937 PATENT OFFICE VARIABLE TRANSMISSION MEANS Charles Bancroft, New Canaan, Conn. v Application March e, 1937, Serial No. 129,329

.12 Claims.

This invention relates to improvements in variable transmissions.

A device made according to my invention automatically provides an infinite number of ratios bycoupling an input shaft and an output shaft through gear means. In another form of my invention I use an extra clutch and gears to obtain a more emcient low speed because the clutch operates positively and friction losses are reduced.

In the drawings: 7

Figure 1 represents a longitudinal vertical cross-section taken through one form of a device made according to my invention;

Figure 2 represents partial longitudinal vertical cross-section of a modification of the form shown in Fig. 1, inwhich I have substituted spur gears for the internal gears of Figure 1;

Figure 3 represents a longitudinal vertical crosssection of a further modification of the form shown in Figure 1 in which a clutch is used to control the speed of one of the cages or frames to obtain a more efficient low speed; and

Figure 4 represents a longitudinal cross-section of another form of my invention with the casing or housing omitted.

Referring now to the drawings, the reference character I6 designates a housing or stator forreceiving my transmission means. The stator may be made of several pieces bolted together. Mounted approximately in the middle of the stator I6 is a fulcrum member I2 capable of rotation within said stator and held in bearings I4 and one way locking device I6. Clutch face I8 mounted on 'member I2 and clutch face 26 u slidably mounted on stator I6 are provided to cooperate with one way locking device I6 in holding member I2 stationary with respect to the stator I6. Since there is only 'one exceptional condition under which fulcrum member I2 is ever allowed movement with respect to. stator I6, 'which case willbe described later, for the purposes of the greater part of this description, member I2 may be considered as an integral part of said stator.

Mounted rotatably in fulcrum member I2 by means of extension 22, which is an integral part of it, is frame 24. Rotatably mounted on extension 22 by means of its integral flange 26 is frame 28. Bearing 21 is provided for flange 26.

Extension 22 of frame 24 is provided with spur gear 36 and frame 28 is provided with internal gear 32 and both these gears engage with planetary gears 34 which latter have their cylindrical ends 36 and 38 rotatably mounted in bearings provided in member I2 and inmember 46, a

(Cl. IL-260) hub extension of member I2. It is to be noted that gears 34, are wider than ring gear 32 to permit longitudinal movement of frame 28 with respect to gears 84 and members I2 and 46 without a resulting disengagement of internal gear 32 from gears 34.

Rotatably mounted in bearing 44 in one end of stator I6 is input shaft 46. Output shaft 41 is rotatably mounted in bearing 48 in the other end of stator. Between input shaft 46 and output shaft 41 and coaxial with them is shaft 56 rotatably mounted in bearing 62 in extension 22 of member 24 and having extensions 56 and 51 rotatably mounted in bearings 58 and 66 provided in input and output shafts 46 and 41.

Secured to input shaft 46 and mounted within the stator is a hub 62 provided with an extension 64. Mounted between hub 62 and its extension 64 is a plurality of planetary gears 66 having their cylindrical ends 68 mounted in bores 16 provided with bearings 12 in hub 62 and in bores 14 provided with bearings 16 in hub extension 64. D

Gears 66 mesh with a ring gear 18 fixed in frame 28 and with a sun gear 86 keyed to one end of the intermediate shaft 56. Gear '86 abuts against bearings 82. It is to be noted that gears 66 are wider than ring gear I8 to permit longitudinal movement of frame 26 with respect to gears 66 and hub 62 without a resulting disengagement of ring gear 18 from gears 66.

Hub 62 is provided with an enlarged head 8 and a bevelled annular surface 85 adapted to serve as a clutch surface when a correspondingly shaped member 86 provided on frame 26 is moved against it.

Fulcrum member I2 is provided on one side with a bevelled clutch face 88 and this clutch face is adapted for engagement with a bevelled clutch surface 66 provided on frame 24.; These clutch surfaces are brought into engagement when forward speeds are desired. Any other form of clutch suchas a hydraulic clutch may he used instead of the clutch shown. Q

Secured to output shaft 41 and mounted within the stator I6 is a hub 92 provided with an extension 94. Mounted between hub 92 and extension 94 is a plurality of planetary gears 96 having their cylindrical ends 98 and I66 mounted in hub 92 and extension 94.

Gears 96 mesh with a ring gear I62 fixed in frame 24 and with a sun gear I64 to the end of intermediate shaft 56. It is to be noted that gears 86 are wider than ring gear I62 to permit longitudinal movement of frame 24 with respect to gears 96 and hub 92 without a resulting disengagement of ring gear I02 from gears 96.

Frame 24 has an annular groove I06 near one end thereof to receive the ends I01 of centrifugal weights I08 which are pivoted at IIO, to a flange which is an integral part of shaft 41 so that, as the speed of shaft 41 increases during the operation of the device, the weights will move outwardly to move frame 24 to the right in Fig. l,

thereby exerting a pressure to force clutch faces 88 and 90 into engagement. Manual means are provided for accomplishing the same result and includes a lever II2 pivoted to the stator at H4 and provided at its lower end with a fork H6 which engages a pin H8 on a collar I20 having an annular groove I22 to receive the upper end I24 of centrifugal weights I08. Movement of the lever to the right in Fig. 1 will cause clutch faces 88 and 90 to engage.

The link I26, pivoted to lever I12 and connected to arm I21 has a slot I28 to permit movementof lever M2 to the left in Fig. 1 without disturbing or moving link I26 to the left. In this way, cage 24 and, consequently, cage 28 is moved to the left in Fig. 1 to cause engagement of clutch faces 86 and 86 in order to obtain reverse rotation of the output shaft.

When clutch faces 88 and 90 are completely engaged and all rotation of frames 24 and 28 with respect to frame If is stopped, the device is in high giving a one to one ratio between input shaft 46 and output shaft 41. Under these conditions, there is no longer any leverage exerted on fulcrum member I8 tending to turn it backward and the only force acting on it is the friction in the gears which tends to rotate it forward carrying it and the frames 28 and 24, which are locked to it by clutch faces 88 and 90, around as a unit with the output and input shafts. To allow this to occur clutch face 20 which has been engaged with clutch face I8 through action of springs 130 to prevent in cooperation with one way bearing I6 any motion of member I2, is connected through link I26 to lever H2 and, as this lever is moved to the right through the action of the centrifugal weights I08, the clutch faces are disengaged. One way bearing I6 prevents fulcrum member I2 from ever turning backward under any conditions. However, as a one to one ratio is reached, the only tendency of member I2 is to turn forward and, with clutch faces I8 and 20 released from engagement with each other, it is free to do this and does, rotating forward as a unit with the input and output shafts, stopping all relative motion of the gears and giving a direct couple between input shaft 46 and output shaft 41.

From the foregoing description, it will be seen.

that frame 24 is coupled to shaft 50 and sungear I04 through gearing mounted on member I2, frame 28, gearing mounted in hub 62, and sun gear so that, when input shaft 46 is stationary,

any movement imparted to frame 24 will also beimparted to gear I04 and consequently to hub 92 and output shaft 41. It will be further seen, that input shaft 46 is coupled to output shaft 41 through planetary gears 66, sun gear 80, shaft 50, sun gear I04, and planetary gears 96 so that, when frames 24 and 28 are stationary, any movement imparted to input shaft- 46 and hub 62 will also be imparted to hub 92 and output shaft 41. Thus, we have two independent parts each capable of imparting rotation to output shaft 41 independently of the other and, consequently, the rotation of the output shaft, must equal the sum or the difference of the rotations of these two parts. Thus, if the input shaft is rotating forward at a. certain speed and frame 24 is rotating backward at a speed sufficient so that ring gear I02 passes the same number of teeth by planetary gears 96 backward as sun gear I04 passes forward, the difference between the two movements imparted to output shaft 41 will be zero and this shaft will not rotate.

If the speed of input shaft 46 is not changed, but the backward rotation of frame 24 is reduced then ring gear I02 will not pass the same number of teeth backwards by planetary gears 96 as sun gear I04 passes forward and the output shaft 41 will have a forward motion equal to the difference. If backward rotation of frame 24 is increased rather than reduced, output shaft 41 will be given a backward motion. This latter condition occurs when clutch faces and 86 are engaged to give reverse.

The operation of the device shown in Fig. 1 will now be given. With input shaft 46 rotating at a constant speed and in the direction shown in Fig. l and with the device in neutral, clutch faces I8 and 20 are pressed together and cooperate with the free wheeling or one way locking device I8 to prevent rotation of annular fulcrum member I2, and hub 62 and cage 28 rotate in the same direction as input shaft 46 but at different speeds, and sun gears 80 and I04 rotate forward in the same direction as input shaft 46 but at different speeds. Frame 24, reacting from the resistance of output shaft 41 to motion, will rotate backwards and through the gearing mounted on fulcrum I2 cooperates with the gearing mounted in hub 62 and input shaft 46 in driving frame 28 forward.

In order to have neutral position, planetary gears 96 must stand still as far as orbital rotation is concerned but each gear 96 does rotate on its own axis. To obtain this condition, ring gear I02 on frame 24 must pass the same number of teeth by planetary gears 96 as sun gear I04 on shaft 50 but with the gears rotating in opposite directions.

When control lever H2 is pushed to the right, clutch faces 88 and are engaged, causing a resistance to the backward motion of frame 24 which results in motion forward of output shaft. As the engagement of clutch faces 88 and 90 becomes increasingly effective, this result being achieved through the action of weights I08 as a result of centrifugal force, the backward rotation of frame 24 decreases and the forward speed of output shaft 41 increases until complete engagement of the clutch faces is effected and output shaft 41 rotates at the same speed as inputv shaft 46. In this condition, rotation of frame 24 with respect to fulcrum I2 has completely ceased. The complete engagement of clutch faces 88 and 90 also causes complete release of clutch faces I8 and 20, the longitudinal movement of frame 24 necessary to effect such engagement pulling clutch face 20 away from clutch face I8 by means of lever I I2 and rod I 21. With the attainment of one-to-one drive between input shaft 46 and output shaft 41, all reaction forces tending to turn fulcrum I2 backward cease and as the free wheeling unit I6 permits forward movement of member I2, the member I2 starts to turn forward as a unit with input shaft 46 and output shaft 41 due to normal frictional resistance to rotation of the gears of the device. This results in a direct drive, the whole device rotating as a unit. In this way, it will be seen that an infinite number of gear ratios is automatically obtained.

To obtain reverse with the device in .neutral .as above described, it is necessary to increase backward speed of frame 24 and have gearing "I02 pass a greater number of teeth by planetary gears 96 than sun gear I04 on shaft 50. To obtain this condition lever I I2 is moved to the left in Fig. 1 to disengage clutch parts 88 and 80. and to permit engagement between clutch faces I8 and 20 to hold fulcrum member I2 stationary and cause engagement between clutch faces 85 and 86. The springs I30 maintain clutch faces I8 and rotate at increased speed in the opposite direction,

the gear I02 passing more teeth than gear I04 to cause reverse planetary motion of gears 96, and consequently, of hub 92 and output shaft 41.

With the above explanation of the operation, it will be seen that the opposing forces are applied at the fulcrum member l2. The moving force of cage 28 is in one direction and the moving force of the frame 24 is in the other direction and the forces are opposed through planetary gears 34 mounted in member I2 and hub extension 26. I

In Fig. 2, I have shown a modification of the form of my invention shown in Fig. 1. The device shown in Fig. 1 includes ring gears which are more expensive than spur gears and in the form shown in Fig. 2 I have-eliminated rin gears and have included spur gears. However, the device shown in Fig. 2 operates in substantially the same way as the device shown in Fig. 1. Input shaft I60 is secured to sun gear I62 meshing with planetary gears I64 rotatably mounted in frame I66. Coaxial with gears I64 and fixed in their relation to each other are planetary gears I68 which are smaller than gears I64. Gears I68 mesh with sun gear I10 keyed to intermediate shaft I12 which is coaxial with input shaft I60.

Formed integrally with frame I66 is another frame I14, the frames being connected by a sleeve I15 mounted on hearing 116 on shaft I12. Positioned within frame I14 and rotatably mounted on intermediate shaft I12 is a sun gear I80 meshing with planetary gears I82 rotatably mounted in frame I14. Sun -gear I80 is integral with sleeve I83 extending from frame I84 later to be described. Coaxial with gears I82 and fixed in relation to them are larger planetarygears I85 meshing with sun gear I86 integral with fulcrum member I81 through hub I88. The frame I14 has a thickened portion I89 which abuts sun gear I86.

Member I81 is mounted in housing or stator I00 and a free wheeling device I92 permits rotation of the member I81 in one direction but not in the opposite direction asin the form shown in Fig. 1. The member I81 corresponds to the fulcrum member l2 in Fig. 1. Clutch member I94 is provided on member I81 and clutch member I96 is provided which is actuated through rod I98 similar to the actuating rod in Fig. 1. The member I81 has a clutch face 204 which coacts with clutch face 206 on frame I84.

Mounted inframe I84 are planetary gears 20 meshing with sun gear 208 keyed to shaft I12. Coaxial with gears 201 and fixed in their relation to them are larger planetary gears 210 meshing with sun gear 2I2 on output shaft 2I4. Centrifugal weights 2I6 are provided and mechanical operating means 218 is provided similar to that shown in Fig. 1.

The operation of the device shown inFig. 2 is substantially the same as above given for Fig. 1 and will not be repeated. As in the device shown in Fig. 1, movement of either frame I84 or input shaft I60 will be imparted to output shaftj I 4 and movement of output shaft 2I4 will be thesum or difference of their combined movements.

In Fig. 3 I have shown another form of my invention which is the same as the device shown in Fig. 1, except that an additional clutch and connecting gears have been included. A stator or housing 220 is provided, having input shaft 222 and output shaft 224. The hub 226, frame 228 and frame 230are duplicate constructions of hub 62, frame 28 and frame 24 of Fig. l. The clutch parts 23I and 232 through gearing 234 and 286 on shaft 238 control the rotation of frame 228 and so control the movement of frame 230 to prevent a higher gear ratio than a predetermined maximum in low gear. The clutch is operated by a pivoted arm 240 which is pivotally connected to lever 242 connected to vertical control arm 244 which also controls the movement of frame 230 through a linkage as in the form Inv which permits rotation of clutch p'art 23I with respect to the shaft in only one direction. If the shaft is standing still, clutch part 28I can only be moved backward. If the input shaft 222 is rotating in the direction of the arrow, part 23I can remain stationary or rotate up to the speed of the shaft but not faster than the speed of the shaft. Clutch part or plate 232, therefore, when engaged, is also prevented from turning forward more than shaft 222. Face 232 is connected through gears 234 and 236 to frame 228 and the ratio of the gears is chosen such that frame 228 must o proportionately slower than plate 232 and, consequently, input shaft 222.

. Since frame 228 rotates faster as the ratio between input shaft 222 and output shaft 224 is raised and the frame 228 is prevented from rotating above a maximum fixed speed, this prevents the ratio from increasing above a predetermined level, and therefore, engagement of clutch parts 23I and 232 limits the possible maximum ratio of the device and forces forward rotation of the output shaft 224. However, since this connection between frame 228 andshaft 222 is established through one-way clutch 254 which allows slower motion of frame 228,thespeedoftheframe can be reduced at will or stopped so as to reduce the ratio or provide a one-to-one coupling of the parts of the device. This latter effect is caused by clutch faces 248 and 250 which are brought into engagement by the action of centrifugal weights 260 as the velocity of output shaft 224 increases, or as soon as rotation is imparted to the output shaft. The rest of the operation of. the device is the same as that described in Fig. 1. l 1

In neutral or in reverse clutch faces 23I and 232 are not engaged and the gear mechanism 234, 236 is not employed. The gear mechanism 234, 230 is carried on an extension 264 of fulcrum member 266, and the gears rotate as a unit when direct coupling is effected by release of clutch faces 2687210 as described in connection with the device shown in Fig. 1.

In Fig. 4 I have shown another modification of my invention in which I have substituted bevelled gears for the gears shown in the other forms of my invention. The stator or housing is omitted from the drawings. Input shaft 200 has a hub 282. Rotatably mounted in hub 282 are planetary bevelled gears 284 which have one stub shaft 286 mounted in hub 282 and another stub shaft 288 mounted in ring 290. Gears 28d mesh with a sun bevelled gear 292 mounted on one end of intermediate shaft 294 which is coaxial with input shaft 280 and output shaft 296. Gears 284 also mesh with bevelled sun gear 298 on frame 300, frame 300 being rotatably mounted on the intermediate shaft 294.

Frame 300 has a bevelled sun gear 302 meshing with bevelled planetary gears 304. Gears 804 have stub shafts 306 rotatably mounted in fulcrum member 300 and ring 3| 0. Meshing with planetary gears 304 is another bevelled sun gear 3l2 forming part of frame 3M rotatably mounted on intermediate shaft 294. Fulcrum member 308 has a clutch face 316 which is adapted to cooperate with clutch face 3l8 on frame 3. Frame 3 has a bevelled sun gear 320 which meshes with bevelled planetary gears 822 rotatably mounted in hub 324 connected to output shaft 296.| Planetary gears 322 mesh with bevelled sun gear 326 secured to intermediate shaft 294.

Comparing the construction shown in Fig. 4 with that shown in Fig. 1, it will be seen that hub 202 in Fig. 4 corresponds to hub 62 in Fig. 1, frame 300 corresponds to frame 28, fulcrum member 308 corresponds to fulcrum member I2 and frame 3M corresponds to frame 24. From the above comparison it will be apparent that the operation of the construction shown in Fig. 4 will be substantially the same as the operation of the construction shown in Fig. 1 and need not be repeated.

What I claim is:-

l. A device of the character described, including, in combination, a stator, an input shaft and an output shaft rotatably mounted in said stator, an intermediate'shaft in said stator and arranged coaxially with said other shafts, a hub secured to said input shaft, planetary gears rotatably mounted in said hub, a sun gear on said intermediate shaft and meshing with said planetary gears, a frame rotatably mounted on said intermediate shaft, gearing on said frame meshing withsaid planetary gears, a fulcrum member, gears rotatably mounted in said fulcrum member and associated with said frame, another frame associated with said fulcrum member and having a gear therein, a second sun gear on said intermediate shaft, a hub secured to said output shaft, planetary gears rotatably mounted in said hub and meshing with said second sun gearand said gear on last-mentioned frame.

2. A device of the character described, including, in combination, a stator, an input shaft and an output shaft rotatably mounted in said stator, an intermediate shaft in said stator and arranged coaxially with said other shafts, a hub secured to said input shaft, planetary gears rotatably mounted in said hub, a sun gear on said intermediate shaft and meshing with said planeber, gears rotatably mounted in said fulcrum member and associated with said frame, a second frame associated with said fulcrum member and having a gear therein, a second sun gear on said intermediate shaft, a hub secured to said output shaft, planetary gears rotatably mounted in said hub, meshing with said second sun gear and said gear on said second frame, and clutch means between said second frame and fulcrum member for connecting said frame and fulcrum, and means for operating said clutch means.

3. A device of the character described, including, in combination, a stator, an input shaft and an output shaft rotatably mounted in said stator, an intermediate shaft in said stator and arranged coaxially with said input and output shafts, a hub secured to said input shaft, planetary gears rotatably mounted in said hub, a sun gear on said intermediate shaft and meshing with said planetary gears, a frame rotatably mounted on said intermediate shaft, gears in said frame, a second frame having gearing associated with said gears in said frame, a second cured to said output shaft, planetary gears in said hub and meshing with gearing in said second frame and with said second sun gear.

4. A device of the character described, including, in combination, a stator, an input shaft and an output shaft rotatably mounted in said stator, an intermediate shaft in said stator and arranged coaxially with said input and output shafts, a hub secured to said input shaft, planetary gears rotatably mounted in said hub, a sun gear on said intermediate shaft and meshing with said planetary gears, a frame rotatably mounted on said intermediate shaft, gears in said frame, a second frame having gearingassociated with said gears in said frame, a second sun gear on said intermediate shaft, a hub secured to said output shaft, planetary gears in said hub and meshing with said second sun gear and with gearing in said second frame, and means for controlling the rotation of said first frame during a certain period of operation.

5. A device of the character described, including, in combination, a stator, an input shaft and an output shaft rotatably mounted in said stator, an intermediate shaft in said stator and arranged coaxially with said input and output shafts, a hub secured to said input shaft, planetary gears rotatably mounted in said hub, a sun gear on said intermediate shaft and meshing with said planetary gears, a frame rotatably mounted on said intermediate shaft, gears in said frame, a second frame having gearing associated with said gears in said frame, a second sun gear on said intermediate shaft, a hub secured to said output shaft, gears in said hub and meshing with said second sun gear and with gearing in said second frame, said hub secured to said input shaft and first frame having cooperating clutch faces, and means for causing engagement of said clutch faces for causing reverse rotation of said output shaft.

6. A device of the character described, including, in combination, a.- stator, an input shaft and an output shaft rotatably mounted in said stator, an intermediate shaft in said stator and arranged coaxially with said input and output shafts, a hub secured to said input shaft, planetary ears rotatably mounted in said hub. a sun sun gear on said intermediate shaft, a hub se- I gear on said intermediate shaft and meshing with said planetary gears, a frame rotatably mounted on said intermediate shaft, gears in said frame, a second frame having gearing associated with said gears in said first frame, a second sun gear on said intermediate shaft, a hub secured to said output shaft, planetary gears rotatably mounted in said hub and meshing with said second sun gear, and means for controlling the rotation of said second frame for varying the I rotation of said output shaft with respect to said shaft, planetary gears rotatably mounted in said input shaft.

7. A device of the character described, including, in combination, a stator, an input shaft and an output shaft rotatably mounted in said stator, an intermediate shaft in said stator and arranged coaxially with said input and output shafts, a hub secured to said input shaft, planetary gears rotatably mounted in said hub, a sun gear on said intermediate shaft and meshing with said planetary gears, a fulcrum member in said stator, planetary gears rotatably mounted in said fulcrum member, gearing between said two sets of planetary gears, a frame having gear ing associated with said planetary gears in said fulcrum member, another sun gear on said intermediate shaft, a hub secured to said output shaft, planetary gears mounted in said hub and.

meshing with said last-mentioned sun gear, said frame having another gearing meshing with said last-mentioned planetary gears.

8. A device of the character described, including, in combination, a stator, an input shaft and an output shaft rotatably mounted in said stator, an intermediate shaft in said stator and arranged coaxially with said input and output shafts, a hub secured to said input shaft, planetary gears rotatably mounted in said hub, a sun gear on said intermediate shaft and meshing with said planetary gears, a fulcrum member in said stator, planetary gears rotatably mounted in said fulcrum member, gearing between said two sets of planetary gears, a frame having gearing associated with said planetary gears in said fulcrum member, another sun gear on said intermediate shaft, a hub secured to said output hub and meshing with said last-mentioned sun gear, saidframe having another gearing meshing with said last-mentioned planetary gears, and means for controlling or preventing rotation of said frame so that rotation of said output shaft is varied with respect to said input shaft.

9. A device of the character described, including, in combinatioma stator, an input shaft and an output shaft rotatably mounted in said stator, an intermediate shaft in said stator and arranged coaxially with said input and output shafts, a hub secured to said input shaft, planetary gears rotatably mounted in said hub, a sun gear-on said intermediate shaft and meshing with said planetary gears, a fulcrum member in said stator, planetary gears rotatably mounted in said fulcrum member, gearing between said two sets of planetary gears, a frame having gearing associated with said planetary gears in said fulcrum member, another sun gear on said intermediate shaft, a hub secured to said output shaft, plan- 1 etary gears rotatably mounted in said hub and meshing with said last-mentioned sun gear, said frame having another gearing meshing with said last-mentioned planetary gears, and means for releasing said fulcrum member after the speeds of rotation of the input and output shafts are the same.

10. A device of the character described, including, in combination, a stator, an input shaft and output shaft in said stator, a fixed fulcrum member in said stator, frames rotatably mounted with respect to said shafts and said stator in said stator, gear means associated with said fixed fulcrum and said frames for controlling motion of said frames with respect to each other and said fixed fulcrum, gear means associated with said frames and said output shaft for imparting motion of one of said frames to said output shaft, gear means associated with said. input shaft and said output shaft for imparting motion of said input shaft to said output shaft, means associated with said frames and said fixed fulcrurn member for controlling motion of said frames with respect to said fixed fulcrum member to control motion of output shaft with respect said frames and said output shaft for imparting, motion of one of said frames to said output shaft,

gear means associated with said input shaft and said output shaft for imparting motion of said input shaft to said output shaft, means associated with said frames and said input shaft for controlling the rotation of said frames with respect to said input shaft and saidfixed fulcrum member to control motion of output shaft with respect to said input shaft and said stator.

12. A device of the character described, including, in combination, a stator, an input shaft and output shaft in said stator, a fulcrum membe in said stator, frames rotatably mounted wit respect to said shafts and said stator in said stator, gear means associated with said fulcrum and said frames for controlling motion of said frames with respect to each other and said fulcrum, gear means associated with said frames, said fulcrum, and said output shaft for imparting motion of one of said frames to said output shaft, gear means associated with, said input shaft and said output shaft for imparting motion of said input shaft to said output shaft, means associated with said frames and said input shaft for controlling the rotation of said frames with respect to said input shaft and means for preventing or allowing rotation of said fulcrum member in said stator.

CLES BANCROFT. 

